Excellent PLC
1️⃣ Overview
The Honeywell 10012/1/2 Central Processor uses a flash memory module to store system firmware, configuration, and control logic. Proper installation ensures reliable operation and firmware retention during power cycles.
This guide covers step-by-step installation, safety precautions, and verification procedures.
2️⃣ Safety Precautions
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Power down the HC900 / TDC / Experion system completely.
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Disconnect AC/DC power supply to the CPU module.
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Wear ESD protection (wrist strap or ESD mat).
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Ensure ambient temperature is within 20–25°C.
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Handle flash memory by edges only, avoid touching PCB traces.
⚠️ Warning: Installing flash memory with system powered on can corrupt firmware or damage the CPU board.
3️⃣ Required Tools
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Honeywell-approved flash memory module for 10012/1/2 CPU
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ESD wrist strap
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Small flathead screwdriver (optional for module latch)
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Multimeter (for power verification if needed)
4️⃣ Step-by-Step Installation
Step 1 — Remove CPU Module (if installed)
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Disconnect all network and I/O cables.
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Release CPU module from rack latch.
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Place module on ESD-safe surface.
Step 2 — Access Flash Memory Slot
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Locate the flash memory slot on the CPU PCB (consult CPU diagram/manual).
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Open the protective cover if present.
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Ensure slot pins are clean and free from dust or debris.
Step 3 — Insert Flash Memory Module
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Align the gold edge contacts of the flash memory with the CPU slot.
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Slide module firmly but gently into the slot until fully seated.
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Lock any latches or retention clips.
Tip: Do not force the module; incorrect alignment can bend pins.
Step 4 — Reinstall CPU Module
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Insert CPU module back into the rack.
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Ensure proper alignment with the backplane connector.
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Secure latches and reconnect I/O and communication cables.
Step 5 — Power On & Verification
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Restore power to the system.
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Observe PWR and RUN LEDs on CPU module:
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PWR: solid green
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RUN: blinking green (normal operation)
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Use engineering workstation or SCADA tool to verify flash memory presence:
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Confirm firmware version
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Ensure configuration data is recognized
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No fault codes related to memory
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5️⃣ Troubleshooting
| Symptom | Possible Cause | Action |
|---|---|---|
| CPU does not boot | Flash not seated correctly | Re-seat flash module |
| Memory fault code displayed | Incompatible or defective flash | Replace with approved module |
| LED pattern abnormal | Static discharge or installation error | Power down, reinstall module |
| Firmware not recognized | Wrong module version | Verify part number against CPU revision |
6️⃣ Field Tips
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Always verify firmware compatibility before installation.
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Keep spare flash modules in anti-static packaging.
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Document installation date and firmware version in maintenance logs.
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Avoid repeated insertions/removals to prevent connector wear.
✅ Summary
Installing a flash memory module in a Honeywell 10012/1/2 CPU involves:
Power down → Access flash slot → Insert module → Reinstall CPU → Verify operation
Following this procedure ensures:
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Firmware integrity
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Reliable CPU startup
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Prevention of memory-related faults